Agricultural device	sn



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 O.G. 1221. Identification is by serial number oi. the application and the heading indicates the number of pages of specification, including claims, and of sheets of drawing contained in the application as originally filed. The file of this application is available to the public for inspection; reproduction may be purchased for 30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty'of the disclosed subject matter.

PUBLISHED MAY 6, 1969 777,309 AGRICULTURAL DEVICE Paul Koronka and David Alan Harris, Fernhurst, Haslemere, England, assignors to Imperial Chemical Industries Limited, London, England, a corporation of Great Britain Filed Nov. 20, 1968. Published May 6, 1969 Int. Cl. A01c 5/06; A01b 5/16 US. Cl. 111-88 4 Sheets Drawing. 13 Pages Specification A coulter device is provided for use on a plow which is particularly adapted for use with seed drills and which is capable of cutting through vegetation or other trash to form a slit in the ground into which seed may be sown. The coulter device of this invention comprises a rotatable slit-cutting disc of from 4 to 12 inches in diameter to cut a slit in the ground and a pair of rotatable slit widening discs of from 6 to 12 inches in diameter arranged rearwardly of said slit-cutting disc to widen the slit so formed, the slit-widening discs having a greater diameter than the slit-cutting disc.

y 6, 1969 P. KORONKA EI'AL DEF. PUB.

AGRICULTURAL DEVICE SN 777309 Filed Nov. 20, 1968 Sheet of 4 A Horney:

P. KORONKA E DEF. PUB.

AGRICULTURAL DEVICE 5N 777309 Sheet of 4 May 6, 1969 Filed Nov. 20, 1968 A; A ttorney;

May 6, 1969 P. KORONKA ETAI- DEF. PUB.

AGRICULTURAL DEVICE SN 777309 Sheet 5% of 4 Filed Nov. 20, 1968 Inventor: 22844449 M, Attorney:

C)\\ 1 1969 P. KORONKA E DEF. PUB,

AGRICULTURAL DEVICE SN 777309 H:'. of 4 Sheet Filed Nov. 20, 1968 

